Carburetor



Sept. 13, 1932. v. o. VAN BRIGGLE CARBURETOR Filed May 16, 1929 2 Sheets-Sheet P 13, 1932- v. o. VAN BRIGGLE 1,877,090

CARBURETOR Filed May 16, 1929 2 Sheets-Sheet 2 INVENTOR V/nz'i/vr Q Milk/6a:

Patented Sept. 13, 1932 s r-En STATES VINCENT O. VAN*BRIGG LE, 02E

BRIDGEVILLE, PENNSYLVANIA CARBURETOB Application filed May 16,

This invention relates tocarburetors particularly designed for use in connection with motors of the type so generally employed in automobile and motor-boat constructions.

Among the objects of the present invention are, to provide a valve structure for control ling the admission of both a liquid fuel and air to the mixing'chamber of "the carburetor; to provide a new and improved vacuum controlled valve structure; to provide a construction in which the liquid fuel and air are passed in a downward direction, "after their introduction to the carburetor and before reaching the mixing chamber; to provide in l the mixing chamber or associated therewith efiicient means for vaporization of the liquid fuel, said means disposed in such a manner as to receive the downwardly passing fluids; to provide means 'whereby 'thedesired carburization or vaporization is efi'ected before entering the combustion chamber of 'the'engine and without the necessity of heating the intake manifold, as is usual. or In the accompanying drawings, which i1- lustrate an application of my invention:

Fig. 1 is a top plan view of a carburetor embodying my invention i v Fig. 2, an enlarged vertical sectional view on the line IL-II of F 1; v Fig. 3, a partial view in elevation, particu larly showing the manual control means;

Fig. 4, a cross section on the broken line IV-IV of Fig. 3; v

Fig. 5, a vertical sectional view on the line V,V of Fig. 1, particularly showing the operating sleeve; and Fi 6, a perspective viewof the carburetor valve structure. 7 I

Referring to the drawings, the carburetor upwardly extending cylindrical casing portion 7, and an enlarged head or top portion 8, positioned above the casing means of spaced-apart connectingribs The head 8 is formed with a cylindrical-opening or bore 10 providing a vacuum chamber ato receive a valve structure generally designated A. Casing 7 has a reduced bore 11 in communication Withchamber aa'tits top,an'd'in communication with a' cylindrical chamber b of 5 comprises essentially a base portion 6, an

1929. Serial no. 363,527.

the base portion 6. It will be noted that chamber 3) is-eccentrically disposed-relatively to the axis aa-oaofbOre 11 and=chamber-a,'as will be hereinafter more fully described.

Centrally located with respect to the axis ww and integral with the base portion 6, I provide-"ahollow vertically extending valve post 12, positioned by means of a radially extending rib 13. Said'valve post 12fi-s formed with an-opening' 1 1 terminating 'in a reduced opening 15 at its lower portion to receive a needle valve 16; of the valve-structureA;

The needle valve 16 is rigidly secured at its upper end to a piston or disk 17, which is adapted to reciprocate in the vacuum c'hanibler a: The'diameter of said piston 17 is slightly less than that of the bore of chamber also as to provide sulficientclearance to elimina te friction. The piston 1 7'is provided with a plurality of openings 18, and a depending cylindrical apron 19 having an outer diameter slightly smaller than 'that of the bore 11. On the undersurface of piston 17, between'the apron 19'and the periphery of said piston, is a ring-area 0, adapted to be acted on by atmospheric pressure. The piston 17 is further provided with a centrally disposed hub 20, the under face of which is adapted to normally contact with a hub 21 of a cylindrical'operating sleeve 22. i p Said operating sleeve is movable within the bore 11 of casing 7 and'is adapted to-be manually raised and lowered. To this end,

casing 7 for a portion of its circumference is formed with an inclined slot 23. Extending therethrough and secured to the sleeve 22 bya threaded extension 2 1,1 provide a radial pin'25. At its outer end,-pin 25 is internally threaded to receive a set screw 26 for securs ing'operating wire 27 a'transverse opening 28. The wire 27 isconnected to'operating means (not shown) for manual control, as will be readily understood. The sleeve 22 and in turn'the valve structure A are normally maintained in the position shown in the 'drawin'gs, by means of a tension spring 29 secured to the base portion '6.

An apertured lug extends from one side of the base portion 6 to receive a pivotal teras v minal 31 of a fluid reservoir 32. Said ter minal projects upwardly from the outer end of an inclined arm or bracket 33 integral with the fluid reservoir, and is secured in the opening 34 of the lug by means of a cap screw 35. Such construction permits the fluid reservoir 32 to be moved into different positions to provide a compact unit. The fluid reservoir is of the usual construction, and includes a needle valve 36 operated by a float 37, to control the admission of the fluid from a supply pipe 38 and maintain the fluid at a certain level, as indicated by the line h-h of Fig. 2. The bracket 33 is provided with a fluid port 39 terminating within the opening 34 and communicates with a fluid pot 40 extending upwardly through the rib 13 of base portion 6 for the admission of fluid to the needle valve 16.

. Vacuum chamber a is closed by means of a top 41 secured to the head 8 by screws 42. The chamber 6 is closed by a heating unit generally designated B, secured to the base portion by means of screws 43. The eccentric relation of the chamber Z) to the axis of the valve structure described permits the positioning of an inclined heating and vaporizing plate 43 of the heating unit in a communicating chamber 46; thus allowing an end of the plate to come directly under the needle valve and casing and the fluid to passby gravity over said plate. From the construction described, it will be noted that chamber 6, together with chamber 46, constitutes the mixing chamber of the device and that the liquid fuel and air are passed downwardly into said mixing chamber before mixing.

Plate 43 is provided with staggered upwardly-extending projections 44 to produce a turbulence and maintain the fluid in contact with the heating surface until it becomes vaporized. Heat is introduced under the plate 43 from the exhaust manifold of the engine to which it isapplied and passes through a passage 45, and thence to the exhaust pipe. Such circulation will be readily understood by those skilled in the art. The chamber 46 terminates in a throttle chamber 47 which is adaptedto be connected with the intake manifold 43 of the engine..(not shown) by means of flanges 49 and studs 50.

Disposed on a transverse shaft of said chamber 47, I provide a control or throttle valve 51 in the form of a bent disk inserted n a slot in said shaft and secured thereto in any suitable manner. Said valve :is adapted to be opened by a counter-clockwise rotation see Fig. 2) and has its lower portion d slightly inclined in the direction of rotation. This construction provides a greater opening at all times, which produces a friction by the passage of air thereunder and lifts the mixture'into the air, whereby it is carried into the intake manifold 48 and thence to the cylinders of the motor.

In operation, the throttle 51 is opened and the engine turned over, thus creating a vacuum in the carburetor; said vacuum is transmitted to chamber a through openings 18. Atmospheric pressure acting on the r area 0 of piston 17, raises the valve structure A a slight amount, thereby raising valve 16 and permitting liquid fuel to be drawn from reservoir 32 through ports 39 and 40, and flow downwardly over heating and vap r: .0 plate 43 by gravity action until vaporized 5 action of the projections 44 and the the incoming air passing downwardly thoreover.

When valve structure A is raised, apron 19 raises from sleeve 22, permitting atmospheric air to flow downwardly around the valve post 12 to mix with the liquid fuel on the plate 43. The actionjust described effects a floating of the Valve structure A, whereby the correct amount of air is introduced to mix with a corresponding amount of fluid.

When the motor is to be speeded up, be opening at the valve 51 is increased. The increase of suction tends to draw a greater volume of air through the opening ee-twee the apron 19 and sleeve 22, and decreases the pressure in chamber a, whereby the atmospheric pressure on, area 0 raises the valve structure A, permitting a greater amount oi fluid to be drawn in through opening 15 The parts then become balanced as before, with the increased flow of air and fluid in their proper proportion, passing downwardly over plate 43 and into the engine. H v

To choke the carburetor, as when starting a cold engine, a pull on the wire 27 will operate sleeve 22, hub 21, and raise piston 1'? and its needle valve 16 manually to increase the opening for the passage of fluid.

In the drawings, the normal or idling position of the carburetor is shown. Apron 19 and sleeve 22 are spaced apart silghtly to permit enough air to enter for idling speed of the engine. Also, thesleevo 22 and piston 1'4 are raised slightly, as is needle valve 16, by means'of setscrew 52 threaded within a boss 53 of casing 7 immediately adjacent the slot 23. Said screw contacts wit 2. pin 25 and provides an idling adjustment'for the carburetor.

When a richer mixture is desired, raising sleeve 22 by means of wire 27, will increase the volume of fluid without increasing the amount of air. The opening between apron 19 and sleeve 22 is dependent upon the speed of the motor, as hereinbefore described, and, hence, raising sleeve 22 will effect a raising of piston 17 and its needle valve lfl, admitting a greater amount of fluid for the same volume of air.

It wi ll be noted that a small opening 54 e2;- tends from the face of flange 49 to a point to the rear of throttle valve 51 in chamber l'i. Also atransverse opening 55 is in eomrnunication. with said opening 54 and the atmosphere. The device acts as a drain to prevent overflooding the carburetor and also helps to lift the mixture into the air at the throttle valve for starting, when the plate 43 is cool, producing an induced flow of the mixture. This provides for easily starting the motor due to the admission of atmospheric air through openings 54 and 55, which immediately mixes with the liquid fuel to supply the motor. The liquid fuel is picked up by the incoming air to form an intimate mixture. When the plate 43 becomes heated, admixture takes place thereon, and said openings only serve to supply additional air.

Opening 15 is provided with an upwardly extending passage 56 (Fig. 2) to prevent any siphoning action of the carburetor float cham ber.

I claim:

1. In a carburetor, a mixing chamber, a vacuum controlled valve for controlling the admission of both a liquid fuel and air to the mixing chamber, a heating element, and means for causing a downward flow of both of said fluids into contact with the heating element prior to admixture in said chamber.

2. In a carburetor, a mixing chamber, a vacuum controlled valve for controlling the admission of both a liquid fuel and air to the mixing chamber, means for causing a downward flow of both of said fluids prior to admixture in said chamber, and a heating means onto which the liquid fluid is directly passed prior to admixture, said heating means entering into the conformation of the mixing chamber.

3. In a carburetor, a mixing chamber, a vacuum controlled valve for controlling the admission of both a liquid fuel and air to the mixing chamber including a ported disk ele ment having a hub thereon, a needle valve element, means for causing a downward flow of both of said fluids prior to admixture in said chamber, and a manually operable sleeve having a hub co-acting with the hub on the valve disk for adjusting said needle valve.

4. In a carburetor, a mixing chamber, a valve structure comprising a disk and needle valve elements for respectively controlling the admission of air and a liquid fuel to the mixing chamber, a liquid fuel port controlled by the needle valve, and a vaporizing plate adjacent the mixing chamber and immediately beneath said liquid fuel port onto which said liquid fluid is downwardly directed prior to admixture.

5. In a carburetor, a mixing chamber, a valve structure for controlling the admission of air and liquid fuel to the mixing chamber, said valve structure including a disk element acted on by vacuum and atmospheric pressure to admit a liquid fuel and air in proportional amounts to the mixing chamber, and a vapor-' izing plate adjacent the mixing chamber onto which said liquid fluid is downwardly directed prior to admixture.

6. In a carburetor, a hollow casing, a hollow head above 'the casing having a vacuum controlled valve disk therein, a mixing chamber below said casing. and in communication therewith a valve post centrally disposed within the i casing, ayneedle valve movable with the valve disk and within the valve post, a depending apron on the valve disk for varying the supply of air tothe casing, a liquid fuel port controlled by the'needle valve, heating plate within w the mixing 3 chamber upon which'the liquid fuel is downwardly directed prior to admixture in said chamber.

" "7. In a carburetor, a mixing chamber, a

vacuum controlled valve'for controlling the admission of both a liquid fuel and air to said chamber, said valve including a depending needle valve, an inclined heating plate'within the chamber, aliquid fuel port immediately above the uppermost portion of the heating plate controlled by said needle valve,

anda

whereby the liquid fuel is directed on to said heating plate toflow downwardly thereover by gravity prior to admixture.

8. In a carburetor, a hollow casing, a hollow head above the casing, a mixing chamber below said casing and in communication therewith, air passages between the head and casing, a vacuum controlled valve slidable in the head having an apron thereon for regulating said air passages,a needle valve on the vacuum controlled valve, a liquid fuel port controlled by the needle valve having its discharge opening within the mixing chamber, a heating plate in the mixing chamber and immediately below said discharge opening, and a downward passage of air and liquid fuel through'the casing on to the heating plate prior to admixture.

9. In a carburetor, a hollow casing, a hollow head above the casing, a vacuum controlled valve disk in the head having a portion of its under surface subjected to atmospheric pressure, a liquid fuel valve secured to the disk for controlling a liquid fuel port, a depending apron on the valve disk for varying the supply of air to the casing, a mixing chamber below the casing and in communication therewith, and a heating plate within the mixing chamber upon which the liquid fuel and air are downwardly directed prior to admixture.

10. In a carburetor, a hollow casing, a mixing chamber communicating therewith, a

vacuum controlled valve for controlling the admission of both a liquid fuel and air to the mixing chamber including a needle valve element, a liquid fuel port controlled by the needle valve, a reservoir for containing a hop uid fuel, an arm extending from the reservoir and pivotally secured to the casing, said arm having a passage therein for conveying liquid fuel from the reservoir to the needle valve port, and a heating plate in the mixing chamher on to which the liquid fuel and air are downwardly directed prior to admixture.

11. In a carburetor, a hollow casing, a hollow head above the casing, a vacuum controlled ported valve disk in the head having a portion of its under surface subjected to atmospheric pressure, a liquid fuel valve on the disk for controlling a liquid fuel port, a depending apron on the disk for varying the supply of air to the casing, a hub on the said disk, a sleeve in the hollow casing, a hub on the sleeve adapted to contact with the hub on the disk, and manually operable means secured to the sleeve for rotating and translating the same to adjust the liquid fuel valve.

In testimony whereof I aflix my si -nature.

VINCENT o. VAN BRIG'GLE. 

